c# to vb using Sync Framework 奇怪的错误

Question

我遵循了 Microsoft 的 Sync Framework 演练，它是用 C# 编写的。我希望将其翻译成 VB。我已经尽可能地简化了代码。两种代码都可以正常编译。它们在同一解决方案的 2 个项目下运行。 C# 运行正常，但 VB 给出以下错误。

System.Data.SqlClient.SqlException 未处理 Message=建立与 SQL 服务器的连接时出现与网络相关或特定于实例的错误。服务器未找到或无法访问。验证实例名称是否正确并且 SQL 服务器配置为允许远程连接。（提供商：SQL 网络接口，错误：50 - 发生本地数据库运行时错误。指定的 LocalDB 实例名称无效。 )

搜索此错误会导致连接字符串出错，但如您所见，两个连接字符串是相同的。唯一的区别是一个在 C# 中是运行另一个在 VB.

C#代码是：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Data.SqlClient;
using Microsoft.Synchronization;
using Microsoft.Synchronization.Data;
using Microsoft.Synchronization.Data.SqlServer;


namespace ExecuteExpressSync
{
class Program
{
    static void Main(string[] args)
    {

        SqlConnection clientConn = new SqlConnection("Data Source=(LocalDB)\v11.0;AttachDbFilename=c:\Database\SyncExpressDB.mdf;Integrated Security=True");
        SqlConnection serverConn = new SqlConnection("Data Source=Toshiba\SQLEXPRESST;Initial Catalog=SyncDB;User ID=sa;Password=XXX");

        SyncOrchestrator syncOrchestrator = new SyncOrchestrator();

        syncOrchestrator.LocalProvider = new SqlSyncProvider("ProductsScope", clientConn);
        syncOrchestrator.RemoteProvider = new SqlSyncProvider("ProductsScope", serverConn);

        syncOrchestrator.Direction = SyncDirectionOrder.UploadAndDownload;

        SyncOperationStatistics syncStats = syncOrchestrator.Synchronize();

        Console.WriteLine("Total Changes Downloaded: " + syncStats.DownloadChangesTotal);

    }

}
}

而 VB 代码是：

Imports System.Data.SqlClient
Imports Microsoft.Synchronization
Imports Microsoft.Synchronization.Data
Imports Microsoft.Synchronization.Data.SqlServer

Module Module1

Sub Main()

    Dim clientConn As SqlConnection = New SqlConnection("Data Source=(LocalDB)\v11.0;AttachDbFilename=c:\Database\SyncExpressDB.mdf;Integrated Security=True")
    Dim serverConn As SqlConnection = New SqlConnection("Data Source=Toshiba\SQLEXPRESST;Initial Catalog=SyncDB;User ID=sa;Password=XXX")

    Dim syncOrchestrator As SyncOrchestrator = New SyncOrchestrator

    syncOrchestrator.LocalProvider = New SqlSyncProvider("ProductsScope", clientConn)
    syncOrchestrator.RemoteProvider = New SqlSyncProvider("ProductsScope", serverConn)

    syncOrchestrator.Direction = SyncDirectionOrder.UploadAndDownload

    Dim syncStats As SyncOperationStatistics = syncOrchestrator.Synchronize()

    Console.WriteLine("Total Changes Downloaded: " + syncStats.DownloadChangesTotal)

End Sub


End Module

错误发生在

Dim syncStats As SyncOperationStatistics = syncOrchestrator.Synchronize()

Answer 1

C# 代码在连接字符串中包含双反斜杠，因为需要在字符串文字（或使用逐字字符串文字）中转义它们。在 VB 中不需要，因为 \ 不是转义字符（据我所知）所以你不应该将它们加倍：

Dim clientConn As SqlConnection = New SqlConnection("Data Source=(LocalDB)\v11.0;AttachDbFilename=c:\Database\SyncExpressDB.mdf;Integrated Security=True")
Dim serverConn As SqlConnection = New SqlConnection("Data Source=Toshiba\SQLEXPRESST;Initial Catalog=SyncDB;User ID=sa;Password=XXX")

c# to vb using Sync Framework 奇怪的错误

c# to vb using Sync Framework strange error

c#

vb.net

sql-server

microsoft-sync-framework

localdb